svnadmin dump much slower in Debian Bookworm than in Debian Bullseye

Let me start by saying that I recognize that this situation is probably specific to Debian.  Even so, it seems possible that someone here might be able to give me helpful ideas about where or how to start looking to track down the symptom I am seeing.

A set of svnadmin dump commands that run as part of a backup procedure seem to be _much_ slower in Bookworm than in Bullseye.  Prior to the upgrade to Bullseye, these commands took slightly less than one hour.  After the upgrade, similar commands (dumping a few more revisions) require more than six hours.  The script that performs these commands has not been changed.

Bookworm has subversion 1.14.2.  Bullseye had 1.14.1.

If you had these symptoms, where would you start to look?

Thanks,

Ken